Mobile communication terminal, and system and method for safety service using same

ABSTRACT

A mobile communication terminal and a system and a method for safety service using the terminal for checking the user&#39;s location and a situation of the surroundings of the user at the time of an emergency such as kidnapping, accident, and so on, are provided. The mobile communication terminal includes a camera, an angle-of-view changing unit which changes angle-of-view of the camera, and a controller which controls the angle-of-view changing unit to change the angle-of-view of the camera and controls the camera to capture the surroundings corresponding to the angle-of-view at the time of emergency mode.

CROSS REFERENCE TO RELATED APPLICATION

This application is the national phase under 35 USC 371 of internationalapplication no. PCT/KR2011/007214, filed Sep. 30, 2011, which claims thebenefit of the priority date of Korean application no. 10-2010-0095186,filed Sep. 30, 2010. The contents of the aforementioned applications areincorporated herein in their entirety.

TECHNICAL FIELD

The present invention relates to a mobile communication terminal, and asystem and method for safety service using the same.

BACKGROUND ART

With the recent advancement of terminal and communication networktechnologies, types of services which can be provided for terminalsthrough a communication network are diversifying.

For example, broadcasting services and Internet services using mobilecommunication terminals are being provided and at the same time,location-based services such as a friend finding service and a routeguiding service are provided by exploiting characteristics of mobilecommunication terminals having superior mobility.

DISCLOSURE Technical Problem

The present invention has been made in an effort to provide a mobilecommunication terminal, and a system and method for safety service usingthe method to easily check location and surrounding circumstances of auser at the time of emergency such as kidnapping, accident, and thelike.

Technical Solution

To achieve the objective described above, a mobile communicationterminal according to the present invention comprises a camera and acontroller capturing the surroundings by controlling the camera at thetime of an emergency mode.

Also, a secure service system including a mobile communication terminalaccording to the present invention comprises a function unit carryingout mobile communication to and from the outside and a camera capturingan image and a video, where the camera and the function unitcommunicates with each other through a wireless communication sold underthe trademark BLUETOOTH® and the camera captures the surroundingsindependently of user commands at the time of an emergency mode.

Also, a safety service system including a mobile communication terminalaccording to the present invention comprises a camera, a first terminalincluding a controller controlling the camera for capturing images, asecond terminal, and a server, where, if the first terminal is set to anemergency mode, the first terminal captures the surroundings by usingthe camera and transmits the captured images to the second terminalthrough the server.

Also, a safety service method including a mobile communication terminalaccording to the present invention, if a first terminal including acamera is set to an emergency mode, comprises capturing the surroundingsby using the camera and transmitting location information of the firstterminal to a second terminal through a server.

Advantageous Effects

According to the present invention, a mobile communication terminal anda system and method for safety service captures the surroundings byusing a camera at the time of an emergency mode and provides capturedimages and location information of a user based on the captured images,thereby identifying the user's location more precisely and easily.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a safety service system using a mobile communicationterminal;

FIGS. 2 and 3 illustrate a structure of a mobile communication terminal;

FIGS. 4 to 11 illustrate an emergency mode in more detail;

FIGS. 12 to 16 illustrate change of angle-of-view in detail;

FIGS. 17 and 18 illustrate storing of captured images;

FIGS. 19 and 20 illustrate another structure of a mobile communicationterminal according to the present invention;

FIGS. 21 to 24 illustrate a power supply in more detail;

FIGS. 25 to 36 illustrate a system and method for safety service using amobile communication terminal according to the present invention;

FIGS. 37 to 41 illustrate another method for changing angle-of-view indetail; and

FIG. 42 illustrates a method for capturing images periodically.

BEST MODE

In what follows, a mobile communication terminal according to thepresent invention, and a system and method for safety service using thesame will be described in detail with reference to appended drawings.

The present invention can be modified in various ways and variousembodiments of the present invention can be realized; thus, thisdocument illustrates particular embodiments in the appended drawings anddetailed description of the embodiment will be provided. However, thatis not meant for limiting the present invention to the particularembodiments; rather, it should be understood to include every possiblemodification, equivalent, or substitute of the present invention whichbelongs to the technical principles and scope of the present invention.

Terms such as first, second, and so on can be used for describingvarious components but the components should not be limited by theterms. The terms are introduced only for the purpose of distinguishingone component from the others. For example, a first component may becalled a second component without departing from the scope of thepresent invention and vice versa.

The term of and/or indicates a combination of a plurality of relateditems described or any one of a plurality of related items described.

If a component is said to be “linked” or “connected” to a differentcomponent, the component may be directly linked or connected to thedifferent component but a third component may exist to connect the twocomponents even though the two components may be connected directly. Onthe other hand, if a component is said to be “linked directly” or“connected directly” to another component, it should be interpreted thatthere is no further component between the two components.

Terms used in this document have been introduced only to describeparticular embodiment, not intended to limit the scope of the presentinvention. Singular expression should be interpreted to include pluralexpressions unless otherwise stated explicitly.

Terms such as “include” or “have” are meant to signify existence ofembodied characteristics, numbers, steps, behavior, components, modules,and combinations thereof, which should be understood that possibility ofexistence or addition of one or more characteristics, numbers, steps,behavior, components, modules, and combinations thereof are notprecluded beforehand.

Unless otherwise defined, all the terms used in this document, whetherthey are technical or scientific, possess the same meaning as understoodby those skilled in the art to which the present invention belongs. Theterms such as those defined in a dictionary for general use should beinterpreted to carry the same contextual meaning in the relatedtechnology and they should not be interpreted to possess an ideal orexcessively formal meaning.

In addition, the following embodiments are intended to describecompletely the present invention for those having average knowledge ofthe art; therefore, shape and size of each element in the drawings maybe exaggerated for the sake of more clear description.

FIG. 1 illustrates a safety service system using a mobile communicationterminal.

As shown in the figure, a safety service system comprises a mobilecommunication terminal 100˜103 including a camera (not shown) and aserver 110 managing a plurality of mobile communication terminal100˜103.

A mobile communication terminal 100˜103 is preferred to be the form of amobile phone; the present invention can be applied to any kind ofterminal once it includes a camera capable of capturing an image orvideo. For example, a navigation device including a camera cancorrespond to the mobile communication terminal 100˜103.

The server 110 may be a server belonging to a communication operatorside. The server 110 controls communication between mobile communicationterminals 100˜10. Also, the server 100 can transmit an image captured byan arbitrary mobile communication terminal at an emergency mode to adifferent mobile communication terminal or another server.

In what follows, a safety service system such as the above will bedescribed in more detail.

FIGS. 2 and 3 illustrate a structure of a mobile communication terminal.

First, as shown in FIG. 2, a mobile communication terminal 100˜103according to the present invention comprises a camera 200 and acontroller 210.

The camera 200 can capture an image or a video.

The controller 210 can control the camera 200 to capture an image of thesurroundings in case the mobile communication terminal 100˜103 is set toan emergency mode. Preferably, the controller 210 can control the camera200 to capture an image of the surroundings independently of usercommands in case the mobile communication terminal 100˜103 is set to anemergency mode. In what follows, description about the emergency modewill be provided in more detail.

In addition, the mobile communication terminal 100˜103 can furthercomprise a angle-of-view changing unit 220, a transmit unit 230, astoring unit 240, and a power supply 250.

The angle-of-view changing unit 220 changes the angle-of-view of thecamera 200 according to the control of the controller 210. Theangle-of-view changing unit 220 may be a motor installed at the camera200. Also, being combined with the camera 200, the angle-of-viewchanging unit 220 can be implemented in the form of a module.

The transmit unit 230 transmits data captured by the camera 200, namely,an image or a video, to a server or a different mobile communicationterminal.

The storing unit 240 stores the data captured by the camera 200.

The power supply 250 supplies power required for operating the mobilecommunication terminal 100˜130.

Next, FIG. 3 illustrates a block diagram for which a mobilecommunication terminal 100˜130 according to the present invention isapplied to a mobile phone. In what follows, those already described indetail in FIG. 2 will be omitted.

As shown in FIG. 3, a mobile communication terminal 100˜130 according tothe present invention comprises a camera 200 and a function unit 300.

Here, the function unit 300 comprises a controller 210, an angle-of-viewchanging unit 220, a transmit unit 230, a storing unit 240, a powersupply 250, a receive unit 260, a voice output unit 270, and a displayunit 280.

The receive unit 260 receives voice information, text information, datainformation, image information, video information, and so on from, forexample, a server or a different terminal.

The voice output unit 270 outputs voice information received by thereceive unit 260 for the user to listen to the information according tothe control of the controller 210.

The display unit 280 outputs text information, data information, imageinformation, and video information received by the receive unit 260 forthe user to check the information according to the control of thecontroller 210.

The storing unit 240 stores an image or a video captured by the camera200 and moreover, stores various types of information received by thereceive unit 260 according to the control of the controller 210.

The controller 210 controls the camera 200 to capture an image or avideo of the surroundings by controlling the camera 200 and alsocontrols voice communication and transmission and reception ofinformation. In other words, the controller 210 controls the operationof the camera 200, receive unit 260, transmit 230, storing unit 240,voice output unit 270, angle-of-view changing unit 220, power supply250, and display unit 280.

Here, the function unit 300 may indicate a part of the mobilecommunication terminal 100˜130 excluding the camera 200.

The mobile communication terminal 100˜103 having the structure asdescribed above can be set to an emergency mode in the case of anemergency such as kidnapping, accident, and so on.

In the case of emergency mode, the camera 200 can take an image or avideo of its surroundings according to the control of the controller 210and can also transmit the image or video to the outside through thetransmit unit 230 and can store the image or video in the storing unit240.

In addition, in the case of emergency mode, it is possible for thecamera 200 to take an image or a video of the surroundings atpredetermined intervals. Similarly, in the case of emergency mode, it isequivalently possible for the camera to capture an image or a video ofits surroundings for a predetermined number of times.

To increase the capture effect of the camera 200, it is preferable forthe mobile communication terminal 100˜103 according to the presentinvention to be implemented as a module independent from the functionunit 300. For example, it is possible that the function unit 300 isincorporated into the main body of the mobile communication terminal andthe camera 200 is implemented as a single module separated from thefunction unit 300. In addition, the camera module can be installed atthe position where a field-of-view of the camera is secured.

Other than the emergency mode, the mobile communication terminal 100˜103can be set to a normal mode. Also, in the case of normal mode, differentfrom the emergency mode, compulsory capture, transmission, and storageof an image or a video using the camera 200 may not be carried out.

In what follows, the emergency mode introduced above will be describedin more detail.

FIGS. 4 to 11 illustrate an emergency mode in more detail.

First, the emergency mode is set in case the user leaves a predeterminedregion (safety zone SZ).

As shown in FIG. 4, the user can set an arbitrary region as a safetyzone. The dark shaded region of FIG. 4 corresponds to a safety zone.

In this case, as shown in FIG. 4, if a mobile communication terminal islocated at a position A1 out of the safety zone, the correspondingmobile communication terminal can be set to the emergency mode.

For example, as shown in FIG. 4, parents may set up an arbitrary areaincluding a home P1, a school P2, a private academy1 P3, a library P4,and a private academy2 P5 as the safety zone SZ of the mobilecommunication terminal of their child and transmit the set-upinformation to a server. In this case, if their child leaves the safetyzone, the server recognizes that the mobile communication terminal oftheir child has left the pre-set safety zone and transmits an emergencymode set-up command to the mobile communication terminal of their child.

In other words, in case a predetermined mobile communication terminalleaves a pre-set safety zone, it is possible for a server managing themobile communication terminal to transmit an emergency mode set-upcommand to the corresponding mobile communication terminal, therebysetting up the corresponding mobile communication terminal to theemergency mode.

Similarly, a program can be installed in the mobile communicationterminal, which is intended for setting the corresponding mobilecommunication terminal to the emergency mode when the mobilecommunication terminal leaves a safety zone. In this case, thecorresponding mobile communication terminal recognizes its departurefrom the safety zone based on its location information received from theserver and activates the emergency mode.

For setting up a safety zone, various options can be taken into account,including a method of using an address, a method of selecting anarbitrary area on the map, and so on.

For example, the user may set up the address ranging from 100 to 200 ofNahyeon-dong, Gwanak-gu, Seoul as a safety zone. Likewise, the user mayset up an arbitrary area as a safety zone by employing a method ofdragging a mouse on the map. Moreover, the user may set up a safety zoneby selecting an arbitrary block on the map. Methods for setting up asafety zone are not limited to the above examples.

Meanwhile, the emergency mode can be set up for the case where the userstays in a pre-determined area (dangerous zone DZ).

As shown in FIG. 5, the user can set up an arbitrary area as a dangerouszone. The dark shaded area in FIG. 5 corresponds to a dangerous area.

As shown in FIG. 5, in this case, if a mobile communication terminal islocated at a position A2 within the dangerous zone, it is possible toset the corresponding mobile communication terminal to the emergencymode.

For example, parents can set up an area populated with bars as adangerous zone of a mobile communication terminal of their child andtransmit the set-up information to a server. In this case, if theirchild enters the dangerous zone, the server recognize entry of themobile communication terminal of their child into a predetermineddangerous zone and transmits an emergency mode set-up command to themobile communication terminal of their child. Accordingly, the mobilecommunication terminal of their child is set to the emergency mode.

As described above, if the mobile communication terminal of their childis set to the emergency mode, the camera of the mobile communicationterminal of their child captures an image or a video of the surroundingsand transmits the captured image or video to the mobile communicationterminal of parents through the server. Then the parents can obtaininformation about a situation, the surroundings, nearby buildings, andso on from the mobile communication terminal of their child in theemergency mode. Afterwards, parents can take a prompt action such asreporting emergency to the police and accordingly, their child can beprotected from a danger.

Also, a program can be installed in the mobile communication terminal,which is intended for setting the corresponding mobile communicationterminal to the emergency mode when the mobile communication terminalenters a dangerous zone. In this case, the corresponding mobilecommunication terminal decides based on location information receivedfrom a server that its position has entered a dangerous zone and thusactivates emergency mode.

A method for setting up a dangerous zone can be fully inferred throughthe previous description about a method for setting up a safety zone;therefore, detailed description thereof will be omitted.

Also, emergency mode can be set up for the case where the user deviate apredetermined route.

For example, as shown in FIG. 6, the user may set up a route within anarbitrary area, comprising a first route R1 from his or her home P1 to aschool P2, a second route from the school P2 to a private academy1 P3, athird route from the private academy P30 to a library P4, and a fourthroute from the library P4 to a private academy2 P5. Also, the user candetermine the order of passage for individual via points. The numeral{circle around (1)}{circle around (2)}{circle around (3)}{circle around(4)} marked for each element of FIG. 6 represents the order of viapoints through which the user passes.

As shown in FIG. 7, in this setting, if the mobile communicationterminal moves from home P1 to the private academy P5 via a fifth routeR5 other than the predetermined first, second, third, and fourth routeR1, R2, R3, R4, it is possible that the corresponding mobilecommunication terminal is set to the emergency mode.

For example, parents may set the route R1, R2, R3, R4 of a mobilecommunication terminal of their child beforehand and transmit the presetroute to the server. In this case, if their child moves along adifferent route other than the preset route R1, R2, R3, R4, the serverrecognizes departure of the mobile communication terminal of the childfrom the preset route and transmits an emergency mode set-up command tothe mobile communication terminal of the child. Accordingly, the mobilecommunication terminal of the child can be set to the emergency mode.

Similarly, a program can be installed in the mobile communicationterminal, which is intended for setting the corresponding mobilecommunication terminal to the emergency mode when the mobilecommunication terminal leaves a predetermined route. In this case, thecorresponding mobile communication terminal decides based on locationinformation received from a server that its position has left apredetermined route and thus activates emergency mode.

Also, the emergency mode can be set up in case the user does not followthe order of predetermined passages.

For example, as shown in FIG. 6, the user may set up an order ofpassages within an arbitrary area, where a first route {circle around(1)} starts from home P1 to school P2; a second route {circle around(2)} from the school P2 to a private academy1 P3, a third route {circlearound (3)} from a private academy P3 to a library P4, and a fourthroute {circle around (4)} from the library P4 to a private academy2 P5.

In this case, as shown in FIG. 8, if the mobile communication terminalmoves in a different order other than the predetermined order ofpassages, in other words, if the user moves along a route {circle around(1)} from home P1 to the library P4 and then moves along a route {circlearound (2)} from the library P4 to the private academy1 P3 and thenmoves along a route {circle around (3)} from the private academy1 P3 tothe school P2 and then moves along a route {circle around (4)} from theschool P2 to the private academy2 P5, it is possible to set up thecorresponding mobile communication terminal to emergency mode.

For example, parents can determine the order of routes {circle around(1)}{circle around (2)}{circle around (3)}{circle around (4)} for themobile communication terminal of their child beforehand and transmit thepredetermined information to the server. In this case, if the childmoves in a different route order other than the predetermined order ofroutes, the server recognizes that the child's mobile communicationterminal has left the order of routes and transmits an emergency modeset-up command to the child's mobile communication terminal.Accordingly, the child's mobile communication terminal can be set to theemergency mode.

Similarly, a program can be installed in the mobile communicationterminal, which is intended for setting the corresponding mobilecommunication terminal to the emergency mode when the mobilecommunication terminal does not follow the order of routes. In thiscase, the corresponding mobile communication terminal decides based onlocation information received from a server that its position has left apredetermined order of routes and thus activates emergency mode.

For example, according to the order of routes as shown in FIG. 6, thetime at which the terminal passes the school P2 precedes the time ofpassing the library P4. Meanwhile, if the user follows the route orderas shown in FIG. 8, the time at which the terminal passes the library P4precedes the passage time for the school P2. In this manner, if time topass for each via point is compared with one another, the order ofroutes can be checked and based on the checking result, it is possibleto set the corresponding mobile communication terminal to emergencymode.

Similarly, it is possible for the user of the corresponding mobilecommunication terminal to input the emergency mode set-up commanddirectly.

For example, the user of a mobile communication terminal can input theemergency mode set-up command directly by pushing an emergency modeset-up button prepared in the mobile communication terminal of the userat the time of an emergency situation such as when the user feels athreat being surrounded by hooligans. In that case, since an image or avideo of the hooligans captured by the camera of the mobilecommunication terminal of the user can be transmitted to a server, itwould be useful to protect the user from a potential crime or to arrestoffenders.

Likewise, it is possible to set up emergency mode by receiving anemergency mode set-up command from a different terminal.

For example, parents can transmit an emergency mode set-up command tothe mobile communication terminal of their child by using a mobilecommunication terminal, Internet, wired phone, and so on.

In this case, the image or video captured by the camera of the mobilecommunication terminal of their child is transmitted to the parentsthrough a server. Accordingly, it is possible for the parents to easilyobtain information about a situation in which their child confronts orprecise location of their child.

Also, it is possible to set a mobile communication terminal to emergencymode if an impact is applied to the corresponding mobile communicationterminal.

For example, in case the user of a mobile communication terminal getsinto an accident being hit by a car while walking along or a relativelybig impact is applied to the mobile communication terminal as the useris attacked by a stranger, the corresponding mobile communicationterminal can be set to emergency mode.

To this purpose, as shown in FIG. 9, it may be more preferable that amobile communication terminal according to the present invention furthercomprises an impact sensor 990.

The impact sensor 990 can sense impact applied from the outside to themobile communication terminal 100˜103.

The controller 210 can determine whether to set up emergency mode byusing an amount of impact sensed by the impact sensor 990. Preferably,the controller 210 set up emergency mode in the case where an amount ofimpact sensed by the impact sensor 990 exceeds a predetermined criticalvalue CV.

For example, as shown in FIG. 10, if impact larger than a predeterminedcritical value is applied from the outside for the duration of D1, themobile communication terminal can be set to emergency mode according tothe control of the controller 210. In this case, since a camera is ableto capture a current situation of the surroundings from the time atwhich impact is applied to the mobile communication terminal, postprocessing of an accident may be easily handled.

Likewise, the controller 210 may set up emergency mode in the case wherea change of the amount of impact sensed by the impact sensor 990 isrelatively large.

For example, as shown in FIG. 11, if impact is applied to a mobilecommunication terminal according to a first pattern B1, the differenceΔim1 between current impact and previous one is relatively small. On theother hand, if impact is applied to the mobile communication terminalaccording to a second pattern B2, the difference Δim2 is larger thanthat of the case of the first pattern B1. In this case, emergency modecan be set up for the case where impact according to the second patternB2 is applied to the mobile communication terminal. It should be notedthat if impact according to the first pattern B1 is applied to themobile communication terminal, normal mode can be set up instead ofemergency mode.

The impact following the first pattern B1 is most likely to correspondto an impact pattern generated when the user makes a regular motion suchas running, horseback riding, and the like.

On the other hand, the impact following the second pattern B2 maycorrespond to a case where an excessively large impact compared with aprevious one is applied instantaneously to the mobile communicationterminal.

Therefore, compared with the impact from the first pattern B1, since itis more likely for the impact according to the second pattern B2 to havebeen generated from an urgent situation such as an accident, it ispreferable to set the mobile communication terminal to emergency modewhen an impact according to the second pattern B2 is applied.

In a similar manner, the corresponding mobile communication terminal canbe set to the emergency mode when a difference between a current amountof impact and the amount of previous impact is larger than apredetermined critical value.

Meanwhile, it may be preferable to apply at least two or more conditionstogether among the emergency mode set-up conditions above meant for amobile communication terminal. More preferably, all of the emergencymode set-up conditions above meant for a mobile communication terminalcan be used.

Meanwhile, the mobile communication terminal can further comprise analarm unit 991. The alarm unit 991 can inform the user about whether toset up an emergency mode at the time of an emergency. For example, themobile communication terminal can make the user recognize activation ofan emergency mode by using vibration, sound, light, and so on.

Also, though not shown in the figure, by displaying activation status ofemergency mode on the display unit, the user can be notified ofactivation of the emergency mode. In this case, the alarm unit 991 canbe removed.

FIGS. 12 to 16 illustrate change of angle-of-view in detail.

As shown in FIG. 12, first of all, whether it is emergency mode isdetermined 1200.

As a result of determination, if it is not in the emergency mode, amobile communication terminal can be set to a normal mode 1240.

On the other hand, if it corresponds to the emergency mode as a resultof determination, an image or a video of the surroundings can becaptured by using a camera included in the mobile communication terminal1210.

Afterwards, the surroundings can be captured again after angle-of-viewof the camera is changed 1220.

In this way, since a situation of the surroundings can be more clearlycaptured if the surroundings are captured as the angle-of-view of thecamera is changed, accident handling, acquisition of more preciselocation information, and so on can be made easy.

For example, as shown in FIG. 13(a), in case the angle-of-view is notchanged and the user of a mobile communication terminal loses sensesfrom a car accident while walking, without help from others, the cameraof the user's mobile communication terminal operating in emergency modeis limited to capture an image or a video of a confined area only.

Accordingly, there may be a case where the camera fails to capture animage of a landmark in the corresponding area, for example, a building,with which the location of the accident can be identified. In this case,it may be difficult to identify the location of the accident exactly.

Meanwhile, as shown in FIG. 13(b), if the angle-of-view of the camera inthe mobile communication terminal can be changed at the time ofemergency mode, a possibility of capturing a landmark in that area isimproved even when the user loses senses. Accordingly, more exactlocation of the accident can be obtained.

As shown in FIG. 14, a camera of a mobile communication terminalaccording to the present invention can take an image or a video of thesurroundings with two angle-of-views. In other words, the camera'sangle-of-view includes a first angle-of-view θ1 and a secondangle-of-view θ2.

For example, the camera first takes an image or a video of thesurroundings with the first angle-of-view θ1 and can then take an imageor a video again after changing its angle-of-view from the first θ1 tothe second angle-of-view θ2.

In this case, to make the image or video captured with the firstangle-of-view θ1; and the image or video captured with the secondangle-of-view θ2 be seamlessly played, it is preferable to make thefirst angle-of-view θ1 and the second angle-of-view θ2 overlap with eachother.

FIG. 14 illustrates a case where an overlapping angle between the firstangle-of-view θ1 and the second angle-of-view θ2 is θ3.

It should be noted that the overlapping angle θ3 between the first θ1and the second angle-of-view θ2 is smaller than the angle θ4 of thefirst angle-of-view θ1 non-overlapping with the second angle-of-view θ2and the angle θ5 of the second angle-of-view θ2 non-overlapping with thefirst angle-of-view θ1.

It is also possible for the case where a change in angle-of-view isrelatively small due to limitation of a movement range of the camerathat the overlapping angle θ3 between the first θ1 and the secondangle-of-view θ2 is larger than the angle θ4 of the first angle-of-viewθ1 non-overlapping with the second angle-of-view θ2 and the angle θ5 ofthe second angle-of-view θ2 non-overlapping with the first angle-of-viewθ1.

As shown in FIG. 15, the angle-of-view of a camera can be chosen inthree ways. In this case, it can be regarded that the angle-of-viewincludes a first angle-of-view θ10, a second angle-of-view θ11, and athird angle-of-view θ12.

For example, to change the angle-of-view sequentially, it is possiblefor the camera to take an image or a video in the order of the firstangle-of-view θ10, second angle-of-view θ11, first angle-of-view θ10,third angle-of-view θ12, and first angle-of-view θ10.

Here, to preserve continuity of images or videos captured by the camera,the first angle-of-view θ10 and the second angle-of-view θ11 overlapswith each other; and the first angle-of-view θ10 and the thirdangle-of-view θ12 overlaps with each other.

Also, it is possible for the first θ10, second θ11, and thirdangle-of-view θ12 to have the same angle. In this case, control of theangle-of-view is made easy.

On the other hand, at least one of the first θ10, second θ11, and thirdangle-of-view θ12 may differ from the others. For example, the firstangle-of-view θ10 corresponding to the central part can be larger thanat least one of the second θ11 and the third angle-of-view θ12.

Also, the angle θ13 formed by overlapping between the firstangle-of-view θ10 and the second angle-of-view θ11; and the angle θ12formed by overlapping between the first angle-of-view θ10 and the thirdangle-of-view θ12 may be narrower than the angle θ15 belonging to thefirst angle-of-view θ10 and not overlapping with the second θ11 and thethird angle-of-view θ12. In this case, capturing an image or a video fora larger area is possible.

Also, the angle θ13 formed by overlapping between the firstangle-of-view θ10 and the second angle-of-view θ11; and the angle θ12formed by overlapping between the first angle-of-view θ10 and the thirdangle-of-view θ12 may be narrower than the angle θ16 belonging to thesecond angle-of-view θ11 but not overlapping with the firstangle-of-view θ10. Also, the angle θ13 formed by overlapping between thefirst angle-of-view θ10 and the second angle-of-view θ11; and the angleθ12 formed by overlapping between the first angle-of-view θ10 and thethird angle-of-view θ12 may be narrower than the angle θ17 belonging tothe third angle-of-view θ12 but not overlapping with the firstangle-of-view θ10.

As described above, a relatively small angle θ13, θ14 formed byoverlapping angle-of-views can be appropriate for the case where theangle-of-view of the camera is small but changing angle-of-view of thecamera is carried out with ease.

Similarly, as shown in FIG. 16, it is also possible that the angle θ13formed by overlapping between the first θ10 and the second angle-of-viewθ11; and the angle θ12 formed by overlapping between the first θ10 andthe third angle-of-view θ12 is larger than the angle θ15 belonging tothe first angle-of-view θ10 but not overlapping with the second θ11 andthe third angle-of-view θ12. In this case, too, capturing an image or avideo for a large area is possible.

Still, the angle θ13 formed by overlapping between the first θ10 and thesecond angle-of-view θ11; and the angle θ12 formed by overlappingbetween the first θ10 and the third angle-of-view θ12 may be larger thanthe angle θ16 belonging to the second angle-of-view θ11 but notoverlapping with the first angle-of-view θ10. Also, the angle θ13 formedby overlapping between the first θ10 and the second angle-of-view θ11;and the angle θ12 formed by overlapping between the first θ10 and thethird angle-of-view θ12 may be larger than the angle θ17 belonging tothe third angle-of-view θ12 but not overlapping with the firstangle-of-view θ10.

As described above, a relatively large angle θ13, θ14 formed byoverlapping angle-of-views can be appropriate for the case where theangle-of-view of the camera is large but changing angle-of-view of thecamera is not easily done.

FIGS. 17 and 18 illustrate storing of captured images.

With reference to FIG. 17, whether it is emergency mode is determined1600; in the case of emergency mode, the camera can take an image orvideo of the surroundings. Here, it is possible to change theangle-of-view of the camera.

After image or video capture, captured image or video can be stored inthe storing unit 1620. Also, captured image or video can be transmittedto the outside independently of a command input of the user. In otherwords, the image or video can be forced to be transmitted.

At the same time, it may be preferable to store the data captured at thetime of emergency mode to protect the data captured by the camera at thetime of emergency mode.

For example, it would be preferable to store data captured at the timeof emergency mode after encryption of the data to avoid manipulating ordeleting data from the scene of an accident such as a hit-and-run byanother person.

To this purpose, space for storing encoded, captured data can beassigned to the storing unit of a mobile communication terminalaccording to the present invention.

For example, as shown in FIG. 18, the storing unit 240 can comprise afirst 241 and a second storing unit 242. Moreover, it is possible for amobile communication terminal according to the present invention tofurther comprise an encryption unit 243 for encryption of data capturedat the time of an emergency.

The first storing unit 241 can stored data captured at the time ofemergency mode. In other words, the first storing unit 241 can storedcaptured data encrypted.

The second storing unit 242 can store data captured during a normal moderather than the emergency mode.

FIGS. 19 and 20 illustrate another structure of a mobile communicationterminal according to the present invention. In what follows, thedescriptions provided in detail above will be omitted. In this document,embodiments of the present invention are described with reference to thestructure of a mobile phone from among mobile communication terminals;however, those descriptions related to FIGS. 19 and 20 are not limitedonly to mobile phones but can also be applied the same for such kind ofmobile communication terminal as a navigation terminal.

With reference to FIG. 19, a mobile communication terminal 300 accordingto the present invention comprises a function unit 300 and a camera 200,where the camera 200 and the function unit 300 can be implemented asseparate modules. Detailed descriptions of the function module 300 havebeen provided with reference to FIG. 3.

The camera 200 and the function unit 300 can communicate with each otherthrough a wireless communication method. More specifically, though notshown in the figure, it may be regarded that a controller of thefunction unit 300 and a camera communicate with each other through awireless communication method. Accordingly, the controller controllingthe camera 200 controls the camera 200 through a wireless communicationmethod.

To this purpose, though not shown in the figure, a communication unitintended for wireless communication can be installed additionally ateach of the camera 200 and the function unit 300.

It is preferred for the camera 200 and the function unit 300 tocommunicate with each other through a wireless communication sold underthe trademark BLUETOOTH® among wireless communication methods. In thecase of a mobile communication terminal according to the presentinvention, a wireless communication sold under the trademark BLUETOOTH®is preferred for a wireless communication method between the camera 200and the function unit 300; however, a different wireless communicationmethod such as an infrared communication method can also be employed.

In this way, if the camera 200 and the function unit 300 communicatewith each other through a wireless communication method, an installationposition of the camera 200 can be selected with more freedom.

For example, as shown in FIG. 20, it is possible to install the camera200 at the glasses worn by the user. In this case, since the camera 200can take an image or a video along a viewing direction of the user, amore useful image or video can be obtained at the time of emergencymode.

Similarly, though not shown in the figure, it is possible to implementthe camera 200 in the form of a necklace. In this case, the user canwear the camera 200 more conveniently.

Moreover, if the camera 200 and the function unit 300 communicate witheach other through a wireless communication method, installation of thecamera 200 at an object such as a hat, a bag, and the like can be donemore easily. Accordingly, a more useful image or video can be obtained.

FIGS. 21 to 24 illustrate a power supply in more detail.

In what follows, detailed descriptions given above will be omitted.

With reference to FIG. 21, the power supply 250 providing power requiredfor operating a mobile communication terminal can comprise a first powersupply 251 and a second power supply 252.

The first power supply 251 can provide power required for operating themobile communication terminal at the time of normal and emergency modeaccording to the control of the controller 210.

In case the first power source 251 is used up and turned off, the secondpower supply 252 can be turned on according to the control of thecontroller 210 at the time of emergency mode and provide power requiredfor operating the mobile communication terminal.

FIG. 22 illustrates operating the power supply 250 having the structuredescribed above.

With reference to FIG. 22, first it is determined whether a currentstatus of a mobile communication terminal is a normal mode 2100.

As a result of determination, in case the current status corresponds tonormal mode, the first power supply 251 can be used as a primary powersource. If the current status is not normal mode as a result ofdetermination, it is determined whether the current status correspondsto an emergency mode 2130.

Afterwards, it is determined whether the first power supply 251 has beenused up and turned off 2120. As a result, in case the first power supply251 is used up, the mobile communication terminal can be set to a lowpower waiting mode 2180.

Here, the low power waiting mode may represent a situation where powerconsumption is actually minimized by cutting off voice communication anddata transmission and reception in the case of normal mode. However, inthe low power waiting mode, a minimal power can be used for determiningwhether emergency mode has been activated.

In the low power waiting mode, it is determined whether emergency modeis activated 2130; in the case of emergency mode, it is determinedwhether the first power supply 251 is available 2140. In case the firstpower supply 251 is unavailable, the second power supply 252 can beturned on 2150.

Afterwards, power is supplied from the second power supply 252 in thelow power waiting mode and accordingly, the camera is enabled to capturean image or a video.

As described above, in the normal mode, the second power supply 252 isnot required and the first power supply 251 provides power required foroperating the mobile communication terminal.

Also, while the first power supply 251 is turned on, image or videocapture is carried out by using the first power supply 251 even ifemergency mode is activated; in case the first power supply 215 is usedup, the mobile communication terminal can wait for the emergency mode isactivated while in the low power waiting mode where power consumption isminimized.

In the meantime, in case the emergency mode is activated while in thelow power waiting mode, the second power supply 252 not required for thenormal mode is turned on and provides power required for operating themobile communication terminal during the emergency mode. In other words,while an auxiliary power supply is maintained in preparation for theemergency mode during a predetermined period of time after a main powersupply is used up, the auxiliary power supply is employed if theemergency mode is activated.

As described above, since the second power supply 252 is intended to beused as an emergency power supply in preparation for a case where thefirst power supply 251 is used up, it is preferable that the capacity ofthe second power supply 252 is smaller than that of the first powersupply 251.

Next, as shown in FIG. 23, instead of employing a separate power supplyin preparation for emergency mode, a single power supply may store anamount of power in preparation for emergency mode by using a singlepower supply.

For example, as shown in FIG. 23, a single power supply 250 can bedivided into a main power source used for operation in the normal modeand emergency mode and an auxiliary power source used for emergency modein case the main power source is used up. Moreover, the main powersource can be set up to occupy approximately 90% of the whole capacityof the power supply 250 while the auxiliary power source is set up tooccupy approximately 10% thereof.

FIG. 24 illustrates operation of the power supply 250 constructed asdescribed above. In what follows, detailed descriptions already providedin FIG. 22 will be omitted.

With reference to FIG. 24, compared with the case of FIG. 22, furthercomprised is a step of dividing the power supply 250 into a main powersupply and an auxiliary power supply 2300.

It is possible to provide power in the same way as the method shown inFIG. 22 after the power supply 250 is divided into a main power sourceand an auxiliary power source. In the example of FIG. 22, the firstpower supply 251 may corresponding to the main power source while thesecond power supply 252 to the auxiliary power source.

FIGS. 25 to 36 illustrate a system and method for safety service using amobile communication terminal according to the present invention. Inwhat follows, detailed descriptions already provided will be omitted.For example, a mobile communication terminal described below mayactually be the same as the terminal described in FIGS. 1 to 24 andtherefore, detailed description of a terminal will be omittedafterwards.

With reference to FIG. 25, a safety service system according to thepresent invention comprises a server 110, a first terminal 100, and asecond terminal 101. Here, for the convenience of description, it isassumed that a single server 110 manages two terminals 100, 101 but thenumber of terminals 100, 101 managed by a single server 110 is notlimited to the example.

For the convenience of description, suppose a first terminal 100 is aterminal 100 for a ward while the second terminal 101 is a terminal 101for a guardian. It is also possible that the first terminal 100 is usedfor a terminal for a guardian while the second terminal 101 is used fora terminal for a ward.

Under an assumption that the first terminal 100 is used for a terminalfor a ward 100 while the second terminal 101 is used for a guardian 101,the first terminal 101 can include a camera capable of capturing animage or video of the surroundings at the time of emergency mode; thesecond terminal 101 can include a camera but is not required to have acamera.

Also, the second terminal, namely, the terminal for a guardian can forcethe terminal for a ward 100 to be set to emergency mode by transmittingan emergency mode set-up command to the first terminal, namely, theterminal for a guardian 100.

The case above is useful for such a situation where it is necessary toset the terminal for a ward 100 to emergency mode even though theterminal for a ward 100 is not set to emergency mode since the terminalfor a ward 100 does not satisfy the conditions for emergency mode. Forexample, when a child possessing the terminal for a ward 100 is notreached even though the terminal for a ward 100 is not set to emergencymode, parents possessing the terminal for a guardian 101 can force theterminal for a ward 100 for their child to be set to the emergency mode.

In case the terminal for a ward 100 is set to emergency mode through amethod described in detail above, the terminal for a ward 100 can takean image or a video of the surroundings by using a camera.

Moreover, the data captured by the terminal for a ward 100 can bedelivered to the terminal for a guardian 101 through a server 110 ordelivered directly to the terminal for a guardian 101. In what follows,for the convenience of description, it is assumed that the terminal fora ward 100 and the terminal for a guardian 101 communicate with eachother through the server 100.

The server 110 can provide location information for the terminal for award 100 and the terminal for a guardian 101. For example, the server110 can provide location information based on GPS to the terminal for award 100 and the terminal for a guardian 101.

Also, the server 110 can transmit to the terminal for a guardian 101 theinformation that the terminal for a ward 100 has been set to emergencymode. Then the user of the terminal for a guardian 101 can check byusing his or her mobile communication terminal that the terminal for award 100 has been set to emergency mode and also check the surroundingsand detailed location of the user of the terminal for a ward 100 bychecking the data captured by the terminal for a ward 100.

Also, the user of the terminal for a guardian 101 can check the locationof the terminal for a ward 100 more accurately by comparing GPS-basedlocation information of the terminal for a ward 100 provided by theserver 110 with image or video data captured by the terminal for a ward100.

Also, as shown in FIG. 26, the server 110 can provide data captured bythe terminal for a ward 101 set to emergency mode or locationinformation of the terminal for a ward 101 to a first server 2500, forexample, a police server. In this case, the police server 2500 canprovide the location information and captured data of the terminal for award 101 to a patrol car 2510 on duty and based thereon, the patrol car2510 can check detailed location of the terminal for a ward 100 andaccordingly can find the user of the terminal for a ward 100 morequickly and safely.

In the above description, it was assumed that the server 110 providesthe police server 250 data captured by the terminal for a ward 101 setto emergency mode and location information of the terminal for a ward101; however, the server 110 can also provide the data captured by theterminal for a ward 101 set to emergency mode and location informationof the terminal for a ward 101 to the police and other security serviceserver.

Also, as shown in FIG. 27, the server 110 can transmit the data capturedby the terminal for a ward 101 set to emergency mode and the locationinformation of the terminal for a ward 101 to a second server 2500.Here, the second server 2600 can correspond to a server 2600 forbroadcasting business such as cable TV.

In this case, the server 2600 can display the data captured by theterminal for a ward 101 set to emergency mode or location information ofthe terminal for a ward 101 on a display means 2610 such as TV, monitor,and so on associated with the user of the terminal for a guardian 101.Then, while watching TV, the user of the terminal for a guardian 101 caneasily check the information that the terminal for a ward 100 has beenset to emergency mode and data captured by the terminal for a ward 101set to emergency mode and location information of the terminal for award 101.

If the second server 2600 of FIG. 27 corresponds to a server for CCTVoperation, the display means 2610 can be a CCTV screen.

As described above, by providing data captured by the terminal for award 101 set to emergency mode and location information of the terminalfor a ward 101 to another server, safety of the user of the terminal fora ward 101 is secured easily and the user of the terminal for a ward 101can be easily protected from a danger.

Meanwhile a system and method for safety service using a mobilecommunication terminal according to the present invention can compensatelocation information of the corresponding mobile communication terminalby using an image or a video captured by the mobile communicationterminal set to emergency mode. In the following, the operation above isdescribed.

It is preferable for a server 100 to include a predetermined image mapin order to compensate location information of a mobile communicationterminal by using an image or a video captured by the correspondingmobile communication terminal set to emergency mode.

The image map can be built by using images or videos captured by users,satellite pictures, three-dimensional drawings, and the like. Forexample, an image map of ‘Gangnam station in Seoul’ can be built byusing images or videos of buildings, signs, road signs, bus stops, andthe like around the ‘Gangnam station’, reminiscent of ‘Gangnam station’.

For example, as shown in FIG. 28, suppose ‘Royal building’ is located asa nearby landmark around a 10-th position P10 where a user with a mobilecommunication terminal is located and a ‘Royal tower’ is located arounda 20-th position P20 separated by a predetermined distance from the10-th position P10 as a landmark in that area.

As a method for obtaining a position of the user, a method foridentifying an approximate position of the user by using base stationsof communication service operators. However, such kind of positioningmethod may incur a relatively large position error. For example, asshown in FIG. 28, while the actual position of the user of the mobilecommunication terminal is around the 10-th position P10, an estimatedposition of the user identified through a method of using base stationsby the server 110 may correspond to the 20-th position P20.

In this case, if the mobile communication terminal is set to emergencymode, the mobile communication terminal of the user can take a pictureof the user's surroundings and transmit the picture to the server 110.Here, the picture transmitted to the server 110 by the mobilecommunication terminal of the user will look similar to what is shown inFIG. 29. In other words, since the position of the user is the 10-thposition P10 around the ‘Royal building’, the picture captured by themobile communication terminal of the user set to emergency mode may havea possibility of containing the image of the ‘Royal building’ which is alandmark of that area.

On the other hand, there may be a chance that the position of the useridentified by the server 110, namely, the image map around the 20-thposition P20 contains the image of the ‘Royal tower’ which is a landmarkof the area containing the 20-th position.

In this case, the server 110 searches the image map for the ‘Royalbuilding’ which is a landmark of the area containing the 10-th positionP10 where the user is actually located, thereby obtaining more preciselocation information of the user.

More specifically, as shown in FIG. 31, if an arbitrary mobilecommunication terminal set to emergency mode transmits a captured datato the server 110, the server 110 compares the captured data transmittedby the mobile communication terminal set to emergency mode with apreviously stored image map 3000.

Next, the server 110 determines whether the pre-stored image map matchesthe captured data transmitted by the mobile communication terminal setto emergency mode 3010.

As a result of determination, in case the pre-stored image map matchesthe captured data transmitted by the mobile communication terminal setto emergency mode, the current location information of the useridentified by the server 110 can be displayed 3060. The locationinformation of the user displayed can be provided to another terminal orserver.

On the other hand, as a result of determination, in case the pre-storedimage map does not match the captured data transmitted by the mobilecommunication terminal set to emergency mode, it is determined againwhether an image map containing the area within a radius R1 from thecurrent location of the user identified by the server 110, namely, the20-th position P20 matches the captured data transmitted by the mobilecommunication terminal set to emergency mode 3030.

As a result of determination, in case the image map containing the areawithin a radius R1 from the 20-th position P20 matches the captured datatransmitted by the mobile communication terminal set to emergency mode,the server 110 determines the position around which a matched object iscontained as the user's location and displays the determined position asthe location information of the user 3060.

On the other hand, as a result of determination, in case the image mapcontaining the area within a radius R1 from the 20-th position P20 doesnot match the captured data transmitted by the mobile communicationterminal set to emergency mode, it can be determined again whether animage map containing the area within a radius R2 larger than R1 from thecurrent location of the user identified by the server, namely, the 20-thposition matches the captured data transmitted by the mobilecommunication terminal set to emergency mode 3050.

As a result of determination, in case the image map containing the areawithin a radius R2 from the 20-th position P20 matches the captured datatransmitted by the mobile communication terminal set to emergency mode,the server 110 determines the position around which a matched object iscontained as the user's location and displays the determined position asthe location information of the user 3060. For example, as shown in FIG.29, the server 110 searches the image map containing the area within aradius R2 from the 20-th position P20 for the ‘Royal building’ containedin the captured data transmitted by the user's mobile communicationterminal and determines the position at which the ‘Royal building’ islocated as the location of the user.

In this case, although the initial location of the user identified bythe server 110 was the 20-th position P20, the location of the usercompensated by using the captured data transmitted by the user's mobilecommunication terminal and the image map can be a position adjacent tothe ‘Royal building’ which is close to the actual location of the user.

In this way, a matching task can be carried out by incrementing thesearch radius from the 20-th position P20.

Meanwhile, in case the pre-stored image map does not match the captureddata transmitted by the mobile communication terminal set to emergencymode, the angle-of-view of the camera of the mobile communicationterminal set to emergency mode can be changed. A detailed description ofa method for changing angle-of-view of the camera is given previouslyabove.

For example, as shown in FIG. 32, if it is found that the image mapcontaining the area within a radius R2 from the 20-th position P20 doesnot match the captured data transmitted by the mobile communicationterminal set to emergency mode 3050, the angle-of-view of the camera ofthe mobile communication terminal can be changed and a new image can becaptured.

In this case, it is possible for the server 110 to change angle-of-viewby transmitting a camera's angle-of-view change command to thecorresponding mobile communication terminal. Similarly, if the server110 transmits the information indicating that the image map within aradius R2 from the 20-th position P20 does not match the captured datatransmitted by the mobile communication terminal set to emergency mode,the corresponding mobile communication terminal can change theangle-of-view of the camera based on the information transmitted.

In the above, described is a case where an image map within apredetermined radius from an arbitrary position is compared with thedata captured by the mobile communication terminal and angle-of-view ofthe camera is changed accordingly; however, camera's angle-of-view canbe changed independently of the method of comparing an image map withthe data captured by the mobile communication terminal as the searchradius is incremented. For example, as shown in the step 3020 of FIG.31, it is possible to recapture an image after changing the camera'sangle-of-view without changing the radius within the image map andcompare the recaptured image with the image map.

For example, since there may be a chance that although the user isactually located at the 20-th position P20, the ‘Royal tower’, which isa landmark in the area around the 20-th position P20, may not becontained in the image or video captured by the corresponding mobilecommunication terminal; therefore, it may be more effective to take apicture again after changing the angle-of-view of the camera.

In what follows, a yet another method for compensating locationinformation will be described.

The user's location can be compensated by using the user's positiondetermined by the server 110 according as time passes and a timedifference.

More specifically, in case the difference between location informationof the mobile communication terminal obtained at a first time point andlocation information of the mobile communication terminal obtained at asecond time point exceeds a predetermined critical range, the server 110can compensate the location of the corresponding mobile communicationterminal by comparing a pre-stored image map and the data captured bythe corresponding mobile communication terminal.

A method for compensating the position of the corresponding mobilecommunication terminal is described in detail with reference to FIGS. 28to 32. To this purpose, a method of recapturing an image by changingcamera's angle-of-view and a method of matching by incrementing a radiuswithin an image map can be applied.

For example, as shown in FIG. 33, suppose the position of the mobilecommunication terminal obtained at a first time point T1 by the server110 is the 10-th position P10 and the position of the mobilecommunication terminal obtained at a second time point T2 after apredetermined time period since the first time point T1 is the 20-thposition P20.

Here, if a time difference between the first T1 and the second timepoint T2 is approximately 10 seconds and the actual distance between the10-th position P10 and the 20-th position P20 is approximately 10 km,the position of the user determined by the server 110 can be regarded tobe wrong. It is because a human can hardly travel 10 km of distancewithin 10 seconds. In this case, the user's location can be compensatedby re-applying the matching task by changing the angle-of-view of thecamera or incrementing the search radius within the image map.

To use the method above, a critical value which can be changed accordingto time can be set up beforehand. For example, setting the criticalvalue of a distance for which the user can travel within one minuteapproximately as 2 km, if a time difference between the first T1 and thesecond time point T2 is approximately one minute and the actual distancebetween the 10-th position P10 and the 20-th position P20 is shorterthan 2 km, the server 110 determines that the confidence level of theuser's location is high and transmits the location information of theuser to another mobile communication terminal or another server. In casethe actual distance between the 10-th position P10 and the 20-thposition P20 is longer than 2 km, the server 110 can compensate thelocation of the user.

More specifically, as shown in FIG. 34, the server 110 can obtain theuser's location measured at the first time point T1 and the user'slocation measured at the second time point T2.

Afterwards, comparing the locations of the mobile communication terminalat the first T1 and the second time point T2 3220, if the distancebetween the locations of the mobile communication terminal at the firstT1 and the second time point T2 is smaller than a critical value, theserver 110 can display the position of the mobile communication terminalat the second time point T2 as the current location information of theuser 3230.

On the other hand, comparing the locations of the mobile communicationterminal at the first T1 and the second time point T2 3220, if thedistance between the locations of the mobile communication terminal atthe first T1 and the second time point T2 is larger than a criticalvalue, the server 110 decides that the position of the mobilecommunication terminal at the second time point T2 is inaccurate and cancarry out camera capture again by changing the camera's angle-of-view orcarry out the task of comparing/matching an image map containing thearea within a predetermined radius from the position of the mobilecommunication terminal at the second time point T2 with the datacaptured by the mobile communication terminal set to emergency mode.

Similarly, in case the terminal for a ward 100 is set to emergency mode,the terminal for a guardian 101 can transmit a re-capture command to theterminal for a ward 100.

For example, as shown in FIG. 35, the data captured by a first terminalset to emergency mode, namely the terminal for a ward 100 is transmitted3400, a second terminal, namely the terminal for a guardian 101 canreceive the data 3410.

Afterwards, the terminal for a guardian 101 determines whether thereceived captured data is in good quality 3420; in case the receivedcaptured data is in poor quality, the terminal for a guardian 101 cantransmit a re-capture command to the terminal for a ward 100. Then theterminal for a ward 100 can transmit the re-captured data.

For example, in case an image or video captured by the terminal for award 100 is blurred or it is difficult to identify the position of theterminal for a ward 100 from the captured data, the guardian cantransmit a re-capture command to the terminal for a ward 100 by usingthe terminal for a guardian 101.

Similarly, as shown in FIG. 36, in case it is determined that captureddata received by the terminal for a guardian 101 is in poor quality3520, the terminal for a guardian 101 can transmit to the terminal for award 100 a re-capture command and a camera setting change command 3530.

In this case, the terminal for a ward 100 can transmit data capturedagain after changing various settings of the camera required for animage or video capture task such as angle-of-view change, on/off settingof flash, resolution change, and the like.

Descriptions of FIG. 36 also found in FIG. 35 will be omitted.

FIGS. 37 to 41 illustrate another method for changing angle-of-view indetail. In what follows, detailed descriptions already provided abovewill not be repeated.

The present invention enables to change angle-of-view of a camera invarious directions.

For example, as shown in FIG. 37, it is possible to change theangle-of-view of the camera 200 along a first and a second direction.Here, a method of changing angle-of-view of a camera has been alreadydescribed in detail above; therefore, repeated descriptions will beomitted.

The first direction may correspond to a horizontal direction withrespect to the camera 200 while the second direction may correspond to avertical direction with respect to the camera 200.

Here, in the case of emergency mode, it is possible that the camera 200first captures an image or a video while changing angle-of-view alongthe horizontal direction (first direction) and then captures an image ora video by changing the angle-of-view along the vertical direction(second direction). In this way, an image or a video for a larger areacan be captured.

For example, as shown in FIG. 38(a), if an image or a video is capturedby changing the angle-of-view of the camera 200 along the horizontaldirection, an image or a video for a larger area along the horizontaldirection can be obtained. In the same manner, as shown in FIG. 38(b),if an image or a video is captured by changing the angle-of-view of thecamera 200 along the vertical direction, an image or a video for alarger area along the vertical direction can be obtained.

As described above, to change the angle-of-view of the camera 200 in avertical and horizontal direction, the line of sight of the camera 200can be change along up, down, left, and right direction, which isillustrated in FIG. 39.

In this case, the angle-of-view of the camera 200 can be changed byinclining the axis of the camera 200.

Likewise, as shown in FIG. 40, it is possible to capture an image or avideo while changing the position of the camera 200.

To this purpose, a mobile communication terminal according to thepresent invention, as shown in FIG. 40(a) can comprise a position movingunit 4000 for moving the position of the camera 200. A guiding groove4010 can be formed in the position moving unit 4000 for guiding thecamera 200.

In this case, as shown in FIG. 40(b), the camera 200 can capture animage or a video while moving along the groove 4010 of the moving unit4000.

For example, as shown in FIG. 40(b), the camera 200 can take an imageafter moving to an upper part of the groove 4010 of the moving unit 4000and then the camera 200 can take an image after moving to a lower partof the groove 4010 of the moving unit 4000 as shown in FIG. 40(c). Inthis case, the camera 200 can take an image or a video for a larger areaalong a vertical direction.

Different from FIG. 40, the groove of the moving unit 4000 can be formedalong a horizontal direction.

Similarly, as shown in FIG. 41(a), the moving unit 4100 can be formed tohave a groove for moving the camera 200 along a vertical and ahorizontal direction.

In this case, as shown in FIG. 41(b), the camera 200 can move in avertical and horizontal direction along the groove 4110 of the movingunit 4100.

FIG. 42 illustrates a method for capturing an image in a periodicmanner. In what follows, detailed descriptions given above will not berepeated.

In the description above, although the camera is used to capture animage or a video of the surroundings in the case of emergency mode andthe captured image or video is transmitted, the camera is capable ofcapturing and transmitting an image or a video at predeterminedintervals.

For example, as shown in FIG. 42, the camera can capture and transmit animage or a video at predetermined intervals according to a clock signalCS provided according to predetermined intervals.

FIG. 42 illustrates a case where the camera is not limited to emergencymode but captures an image or a video in a normal mode at predeterminedintervals P, where a capture and transmission method for the normal modecan be actually the same as the method employed for emergency mode.

In the case of FIG. 42, the captured data can be used as the data formonitoring a movement path of the user in his or her everyday living.

Meanwhile, the mobile communication terminal according to the presentinvention can implement a game function. In what follows, a descriptionthereof will be provided.

For the convenience of description, it is assumed that a terminal A anda terminal B carry out a game function.

The user of the terminal A can carry out a game of guessing orestimating the position of the terminal B.

To this purpose, a camera installed in the terminal B captures an imageof the surroundings of the terminal B and transmits the captured imageto the terminal A.

Here, it is possible for the user of the terminal A to send a capturecommand to the terminal B so that the terminal B take an image of itssurroundings. This situation corresponds to the case where the user ofthe terminal A plays the game.

On the other hand, it is also possible that the user of the terminal Bcaptures an image of its surroundings to allow the user of the terminalA to guess or estimate the position of the terminal B. This situationcorresponds to the case where the user of the terminal B plays the game.

Meanwhile, if image data of the surroundings of the terminal B capturedby the camera installed in the terminal B is transmitted to the terminalA, the user of the terminal A can select the position of the terminal B.

For example, the user of the terminal A checks the image datatransmitted from the terminal B and based on the checked image data, cancome to a conclusion that the position of the terminal B is ‘at thefront of the 7-th exit of Gangnam station’ and the user of the terminalA can input an answer stating that the position of the terminal B is ‘atthe front of the 7-th exit of Gangnam station’.

In case the position of the terminal B is ‘at the front of the 7-th exitof Gangnam station’, it corresponds to the case that the user of theterminal A has provided a right answer and predetermined points areadded to the terminal A.

On the other hand, in case the position of the terminal B is ‘at thefront of the 1st exit of Gangnam station’, it corresponds to the casethat the user of the terminal A has failed to provide a right answer andpredetermined points are taken away from the terminal A.

The game can be played differently from the above.

For example, if the image data of the surroundings of the terminal Bcaptured by the camera installed in the terminal B is transmitted to theterminal A, the user of the terminal A can select the position of theterminal B in the form of a predetermined range.

For example, the user of the terminal A checks the image datatransmitted from the terminal B and based on the checked image data, cancome to a conclusion that the position of the terminal B is ‘aroundGangnam station’ and the user of the terminal A can input an answerstating that the position of the terminal B is ‘within a radius of 100 mfrom Gangnam station’.

If the position of the terminal B is ‘within a radius of 100 m fromGangnam station’, it corresponds to the case that the user of theterminal A has provided a right answer and predetermined points areadded to the terminal A.

On the other hand, if the position of the terminal B is ‘at the front ofSinsa station’, it corresponds to the case that the user of the terminalA has failed to provide a right answer and predetermined points aretaken away from the terminal A.

Also, it is possible to adjust the points according to the radius of aposition range of the terminal B.

For example, if the position of the terminal B is ‘at the front of the7-th exit of Gangnam station’ and the user of the terminal A selects theposition of the terminal B to be ‘at the front of the 7-th exit ofGangnam station’, 100 points can be assigned to the terminal A, whereasif the user of the terminal A selects the position of the terminal B tobe ‘within 50 m from the 7-th exit of Gangnam station’, 50 points may beassigned to the terminal A. Similarly, if the user of the terminal Aselects the position of the terminal B to be ‘within 100 m from the 7-thexit of Gangnam station’, 20 points may be assigned to the terminal A.

In this way, it is possible to increase additional points for the casewhere the position of the terminal B is identified more precisely.

As described above, the additional points can be used for reduction ofservice charges for the terminal A or can be used for providing anadditional service for free.

Such kind of game function can be used to achieve an effect of inducingusers to use mobile communication terminals according to the presentinvention more frequently.

Meanwhile, the terminal A and B can be the same with or different fromeach other.

Also, either of the terminal A and B can be the terminal for a guardianand the other the terminal for a ward.

Similarly, both the terminal A and B can be terminals for a guardian orthe terminals for a ward.

As described above, it should be understood that the technical structureof the present invention described in detail above can be realized inother specific forms by those skilled in the art to which the presentinvention belongs without changing the technical principles or essentialcharacteristics of the present invention.

Therefore, it should be understood that the embodiments described aboveare only exemplary embodiments in all respects and do not limit thetechnical scope of the present invention. The technical scope of thepresent invention should be defined by appended claims below rather thanthe aforementioned specific descriptions; also, it should be understoodthat the meaning and scope of the claims and every possible modificationderived from the equivalent concept thereof or modified forms all belongto the scope of the present invention.

The invention claimed is:
 1. A mobile communication terminal comprising:a camera; a transmit unit; an angle-of-view changing unit which changesan angle-of-view of the camera; and a controller which controls theangle-of-view changing unit to change a position of the angle-of-view ofthe camera from a first angle-of-view to a second angle-of-view along aspecific direction and controls the camera to capture the surroundingscorresponding to the angle-of-view and controls the transmit unit totransmit image data captured by the camera to a server, at the time ofan emergency mode, wherein when an angle-of-view change command isreceived from the server, the controller controls the angle-of-viewchanging unit to change the angle-of-view of the camera.
 2. The mobilecommunication terminal of claim 1, wherein the first angle-of-view andthe second angle-of-view overlap with each other.
 3. The mobilecommunication terminal of claim 1, further comprising the transmit unitwhich transmits the image data captured by the camera to the server oranother terminal, wherein the transmit unit transmits the image data tothe server or another terminal independently of a user's command inputat the time of the emergency mode.
 4. The mobile communication terminalof claim 1, further comprising a storing unit which stores image datacaptured by the camera, wherein the storing unit comprises a firststoring unit which stores image data captured by the camera at the timeof the emergency mode and a second storing unit which stores image datacaptured by the camera at the time of a normal mode.
 5. The mobilecommunication terminal of claim 4, wherein image data captured by thecamera is stored in the first storing unit after encryption.
 6. Themobile communication terminal of claim 1, wherein the controllercontrols the camera through wireless communication, and wherein thecontroller is implemented as a module separately from the camera.
 7. Themobile communication terminal of claim 1, further comprising a firstpower supply providing power at the time of a normal mode and theemergency mode and a second power supply providing power at the time ofthe emergency mode, wherein power of the second power supply is smallerthan that of the first power supply.
 8. The mobile communicationterminal of claim 1, further comprising a power supply providing power,where the power supply is divided into a main power and an auxiliarypower and the power supply provides the auxiliary power when theemergency mode is activated while the main power is used up.
 9. Themobile communication terminal of claim 1, wherein the emergency mode isset when a user leaves a predetermined safety zone.
 10. The mobilecommunication terminal of claim 1, wherein the emergency mode is setwhen a user enters a predetermined dangerous zone.
 11. The mobilecommunication terminal of claim 1, wherein the emergency mode is setwhen a user leaves a predetermine route.
 12. The mobile communicationterminal of claim 1, wherein the emergency mode is set when a userleaves a trajectory on a predetermined route.
 13. The mobilecommunication terminal of claim 1, wherein the emergency mode is setwhen a user enters an emergency mode set-up command.
 14. The mobilecommunication terminal of claim 1, wherein the emergency mode is setwhen an emergency mode set-up command is received wirelessly from theoutside.
 15. The mobile communication terminal of claim 1, wherein theemergency mode is set when an impact larger than a predeterminedcritical value is applied from the outside.
 16. The mobile communicationterminal of claim 1, further comprising an alarm unit informing a userabout activation of an emergency mode at the time of the emergency mode.17. The mobile communication terminal of claim 1, wherein the terminalfurther comprises a position moving unit changing a position of thecamera along the specific direction.
 18. The mobile communicationterminal of claim 17, wherein the position moving unit changes theposition of the camera in upward, downward, left, and right directionsor to tilt the camera with respect to an axis thereof.
 19. The mobilecommunication terminal of claim 1, wherein the server compares the imagedata captured by the camera with a pre-stored image and transmitslocation information of a user to another terminal or server if theimage data matches the pre-stored image.
 20. The mobile communicationterminal of claim 19, wherein the server compares the image datacaptured by the camera with a first pre-stored image within a firstradius from an estimated position of the user calculated based on atelecommunication base station, and if the image data does not match thefirst pre-stored image, the server compares the image data captured bythe camera with a second pre-stored image within a second radius fromthe estimated position of the user so as to find the locationinformation of the user, wherein the second radius is larger than thefirst radius.